Perry had some onstage “fun fun fun fun” with teen sensation Rebecca Black this weekend in Los Angeles. The “infamous” Black (Perry’s words, not ours!) made a surprise appearance alongside the “Last Friday Night (T.G.I.F.)” songstress for a rousing rendition of Black’s meme-tastic hit “Friday” on Aug. 5 – a Friday, conveniently. After the song, Perry gave Black a hug and a big-sisterly pat on the head, and the two proclaimed their mutual affection for one another.

After Black’s exit – to the delight of her fans – Perry shouted, “Dammit! I love the Internet.”